Injector



2 Sheets-Sheet 1.

(Model.)

J. W. GAMBLE.

INJECTOR.

Patented Apr. 1'9', 1898'.

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(Model.) 2 Sheets-Sheet 2. J. W. GAMBLE.

INJBGTOR No. 602,537. Patented Apr.19, 1898.

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JOSEPH VILLARD GAMBLE, OF PHILADELPHIA, PENNSYLVANIA.

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SPECIFICATION forming part of Letters'Patent No. 602,537, dated April19, 1898. Application filed February 11, 1898. Serial No. 669,925.(Model.)

T0 all whom, t may concern/.

Be it known that I, JOSEPH WILLARD GAM- BLE, a citizen of the UnitedStates, residing in the city and county of Philadelphia, State ofPennsylvania, have invented a new and useful Improvement in Injectors,which improvement is fully set forth in the following specification andaccompanying drawings.

My invention relatesoto a valve of special construction adapted to beused in combination with any jet apparatus of the injector type, whichis provided substantially with two sets of instrumentalities, one set oftubes being proportioned for lifting the water and delivering it under amoderate pressure to a second set of tubes, where an additional velocityis imparted to the water, enabling it to overcome a comparatively highcounter-pressure.

In injectors ofthe usual construction of the double-tube type thepressure at the delivery end of the forcing set of tubes is much greaterthan the pressure at the delivery end of the suction or supply set oftubes, the ratio of the pressures between the two sets being usuallyabout four and one-half to one 5 but this ratio may vary considerably,according to the proportions of the tubes, and it is accordingly bytaking advantage of this difference in pressure that I am enabled tooperate my improved injector without the aid of what is known to thoseskilled in the art as a locked overflow mechanism, and I am also furtherable to produce an injector of compact symmetrical design which willconform to the requirements of modern railroad practice as regardscertain external dimensions.

My invention further consists of novel de tails of construction, all aswill be hereinafter fully set forth, and particularly pointed out in theclaims.

Figure 1 represents a longitudinal sectional view of an injectorembodying my invention. Fig. 2 represents a section on line Fig. 1. Fig.3 represents a section on line y y, Fig. 1. Fig. 4t represents asectionon line a a', Fig. 1. Fig. 5 represents a section on line xFig. 1. Fig. 6 represents alongitudinal section on line y y', Fig. 1.

Similar letters of reference indicate corresponding parts in thefigures.

Referring first to Fig. 1, A designates the body, B the steam-inlet, Cthe water-inlet, D4

the outlet to boiler, and E the overflow, of an injector.V f Y Thedifferential valve to which-this invention especially relates is locatedat the lower portion of Fig. 1 and consists of a cap or plug L, carryingthe threaded rings R and R', which are'separated by the threaded ribs Qand Q', said plugbeing adapted to be screwed into the injector-body, asshown in Fig. 1.

The ring R is threaded to receive the valveseat K, the passage throughwhich latter is adapted to be closed by the check-valve J, by whichconstruction I am enabled to allow the piston M, which is adapted to tthe ring R', to be placed in position, said piston M being secured tothe check-valve .I by means of the extension J, which is screwed into,pinned,

or otherwise secured to a boss on the piston M.

E designates a chamber in communication with the delivery end of theforcing-nozzle G and leading to the valve J, while S designates achamber into which the suction or supply set of tubes delivers thewater, said chamber S communicating with the forcing-nozzle and also bymeans of the passage G with the under side of the piston M. i

The forcing combining-tube has the rear end thereof threaded at T andscrewed into the adjacent partition in the injector-body, as will beevident from the upper right portion of Fig. 1, while at the forward endof said tube a collar or shoulder TX is provided, which is adapted toseat on the partition T2 of the injector-body, said tube G beingprovided with vent-holes U U2 for a purpose to be hereinafter described.f

The operation of the injector is vas follows: A movement'of the handle Sby means of the intermediate mechanism withdraws the spindle W and opensthe valve X,attached thereto, which permits steam to enter the chamberL', and thence by the side passages M (best seen in Fig. 2) to pass intothe chamber I The steam then blows throughthe steam suction nozzle H andsuction combining-tube I into the chamber S and passes through thepassage G' under the piston M, lifts the piston and check-valve, andpasses through passage H up under said checkvalve, and thence by meansof the passage F out through the over- ICO liow E. A portion of thesteam will pass between the steam-forcing nozzle F and the forcingcombining-tube G, and thence through the latter tube into the chamber Dand through the passage E', and while a considerable portion of thesteam will escape through ,the vents or openings U U2 there will be aslight pressure on top of the check-valve J but the area of the piston Mbeing about two and onehalf timesv the area of the topyof saidcheckvalve the piston will open and allow the steam to have a free vent.As soon as the water appears, the spindle W being further withdrawn byan additional movement of the handle S, the plug Z is withdrawn from theopening in the steam-forcing nozzle F, thus admitting steam and drivingthe water at al high velocity through the tubes and produc- L ing a highpressure in the chamber D andl Since this pressure is from four passageE'.

greater pressure, though acting on the smaller area, would be sufficientto close said checkvalve and hold it to its seat while the injector wasin operation.

ton can be varied between considerable limits as may be expedient, andit will further be apparent that the area passing said checkvalve andcommunicating with the passage maj7 be restricted as much as necessary.

By making the vents in the tube G sufficiently large to provide for allthe steam that issues from the upper or forcing nozzle the steam mightbe admitted :simultaneously to both steam-nozzles, and the injectorwould perform its functions of lifting its Water-supply and starting tofeed automatically.

The openings in theforcing combining-tube are not intended asa vent Vforthe steam from the suction set of tubes, .as the suction set of tubeswould perform their duty of lifting the water just as well if noopenings were provided in the forcing combining-tube; but the object ofplacing said openings in the forcing combining-tube is as follows: Whenthe water is being driven at a high `velocity .across these openings, avacuum is produced, and, i such being the case, any slight leakage thati may occur around the piston M will be taken up and forced into theboiler, said openings alsoserving the purpose of providing an overiiowmomentarily for the forcing Acombiningtube when the jet is being formed.

The injector may be made to perform its operations -of :startingautomatically .as follows: When steam is admitted to both nozzles, thesteam from .the suction lset will pass to the atmosphere, as previouslydescribed, while the steam from the upper or forcing set of nozzleswhich escapes into the chamber S will take the same vcourse withoutcreating` It will further be evident that the piston M and check-valve Jand their adjuncts may be inserted from the top of the injector andplaced much nearer to the steam-inlet, if so desired.

It will be evident that the exit of the steam from the chamber N iscontrolled by means of the valve DX, which is rotatably mounted in theshell or casing C and actuated by means of the spindle B andthehand-wheel A.

It will of course be understood that the present description has beenespecially confined to the parts which more especially relate to myinvention and its specific manner of application, the features of theinjector which are old and well known being not specically referred to.

It will be evident that slight changes may be made by those skilled inthe art which will come within the scope of my invention, and Itherefore do not desire to be restricted in every instance to the exactconstruction I have herein shown and described.

Having thus `described'my invention, what I claim as new, and desire tosecure by Letters Patent, is-

l. The combination with an injector of a cap, threaded rings attachedthereto, a valve- It will of course be evident that the ratio of theupper or check valve to the lower pis- .seat engaging one of said rings,a check-valve movable on said seat, a piston movable in the other ofsaid rings and connections common to said piston and valve.

2. In an injector, a casing, a lifting set and a forcing set of tubes, adevice adapted to be inserted in said casin g and consisting of a plug,@threaded rings attached thereto, and Vadapted to vengage suitableportion of said casing, a valve-seat adapted 'to engage one of saidrings, a check-valve movable on said valveseat, a piston closing 'theopening through .one lof said rings and connections common to said valveand piston.

3. In .an injector provided with a lifting set and a forcing set oftubes, the combination of a differential check-valve and piston adaptedto receive the pressure from the primary set of tubes on the under sideof the piston and the pressure from the secondary set of tubes on thevalve side of said .differential v-alve and piston.

4. In an injector provid-ed with `a lifting set Vand a forcing set oftubes, the combination of a device consisting of a check-valve having apiston connected thereto, a communicationon the valve side of saiddevice with the delivery -end .of said forcing set and `on the pistonside of said device, with said lifting set and acommunication provided,when said valve is raised, with a chamber closed by a checkvalve whichin turn .communicates with the atmosphere.

5. In an injector provided with a lifting set and a vforcing set .oftubes, the combination of a diiferential valve and its adj unctsconstructed substantially as described and a forcing combining tube, thelatter vbei-ng provided with sufficient vents to enable the steam fromIOO IIO

the forcing steam-nozzle to pass away, thereby dispensing with alloperating mechanism and rendering the injector automatic in its action.

6. In an injector provided With a lifting set and a forcing set oftubes, the combination of a diiferential Valve for the purposesdescribed and means whereby the leakage through the piston of said valvemay be taken up by the suction produced by the forcing combiningtubes.

7. In an injector, a lifting set and a forcing set of tubes, acheck-valve and a piston connected to said Valve, said piston and valvebeing of different areas, and means for enabling the leakage through thesaid piston to JOSEPH IVILLARD GAMBLE.

Witnesses:

JOHN A. WIEDERSHEIM, WM. C. WIEDERSHEIM.

